1 Corinthians 14:8-10

Revised Geneva Translation

⁸ And also if the trumpet gives an uncertain sound, who shall prepare himself to battle?

⁹ So likewise you, by the tongue, unless you utter words that are understood, how shall it be known what is spoken? For you shall speak into the air.

¹⁰ There are, it may be, so many kinds of voices in the world, and none of them without significance.